Hundred is a numerical puzzle that involves strategically placing digits in a grid to achieve specific sums in each row and column. The puzzle is played on a 3x3 or 4x4 grid. Here’s an example Hundred puzzle:

As you can see, the cells are already filled with digits. Your task is to add extra digits into some or all cells in such a way the the sum of the numbers in each row and each column equals 100.

You can add digits before or after those already in a cell. So for example a 7 could become 17 by adding 1 in front of it, or 71 by putting the 1 after it.

There are no restrictions on how often you can use digits, and all the digits from 0 to 9 are on the table.

Here’s what the example puzzle looks like once it’s been solved: